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问：FUNCTION_BLOCK FB_HOMING
VAR_INPUT
myaxis : posaxis;
starthoming : BOOL;
offset : LREAL;
END_VAR
VAR
myRetDINT : DINT;
mystarthomingrtrig : r_trig;
mystarthoming : BOOL;
myaxishomedrtrig : r_trig;
END_VAR
VAR_OUTPUT
my_axishomed : BOOL;
END_VAR
mystarthomingrtrig(clk := starthoming);
myaxishomedrtrig(clk := my_axishomed);
IF mystarthomingrtrig.q THEN
mystarthoming := TRUE;
ELSIF myaxishomedrtrig.q THEN
mystarthoming := FALSE;
END_IF;
myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset;
IF mystarthomingrtrig.q AND myaxis.control=ACTIVE THEN
myRetDINT :=
_homing(
axis := myaxis,
homingmode := ACTIVE_HOMING,
homebtype :=DIRECT,
homeb := 0.0,
velocityprofile := TRAPEZOIDAL,
mergemode := IMMEDIATELY,
nextcommand := WHEN_BUFFER_READY,
commandid := _getcommandid()
);
END_IF;
IF myaxis.bingstate.homed = yes THEN
my_axishomed := TRUE;
ELSE
my_axishomed := FALSE;
END_IF;
END_FUNCTION_BLOCK
问题补充：这段程序，前几段关于变量的定义基本看的懂，后面就不怎么懂了，myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset，又是上面意思呢，myRetDINT，是什么意思？ 那位帮忙解释下？
答：这是一段主动回零的程序。
可以参考一下资料
1、程序首先定义了两个上升沿，当starthoming和axishomed来临时触发两个上升沿。
2、当上升沿mystarthomingrtrig触发后，赋值变量mystarthoming
表示开始回零，当上升沿myaxishomedrtrig触发，变量复位，回零结束（这个上升沿后面将触发）
3、myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset;
是设定一个偏移量，类型为LREAL，具体变量解释可以点击相应的轴看symbol browse，找到这个变量，看它的属性。
4、前面那个上升沿触发，并且轴使能后开始回零指令。myRetDINT只是在执行回零指令_homing()所要求定义的返回值，在VAR里面也定义了，可以随便定义名称的，是一个DINT型，有时可以根据这个返回值确定程序执行的状态。
5、当回零完成后，用轴的回零变量置位my_axishomed， 变量my_axishomed同时又触发上面的上升沿程序。
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